The installation procedure creates the file matlabserver.conf. The file is by default located in /webserver/matlabserver.conf. The file contains the notation:
-m 1 This number represents the number of Matlabs that can run concurrently. After testing that everything is working properly, you can change this number to something more convenient. To see any changes made to matlabserver.conf, the Matlab Web Server must be stopped and restarted.